NUVEEN TAX EXEMPT UNIT TRUST SERIES 732
497, 1994-06-03
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<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     MARYLAND
     TRUST 295
              (MARYLAND TRADITIONAL TRUST 295)
 
            Estimated Current Return
            5.54% to 5.76%
            as of 06/01/94
 
            Estimated Long Term Return
            5.69% to 5.92%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds
                  Cusip:
                  67101L 555 Monthly Payment Option
                  67101L 563 Quarterly Payment Option
                  67101L 571 Semi-Annual Payment Option
 
                  Registered in Maryland
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--MARYLAND TRADITIONAL TRUST 295
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT JUNE 2, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  500,000    Maryland Health and Higher Educational Facilities Authority,       2003 at 102           A            A1
                  Refunding Revenue Bonds, Suburban Hospital Issue, Series
                  1993, 5.125% Due 7/1/21. (Original issue discount bonds
                  delivered on or about October 14, 1993 at a price of
                  94.689% of principal amount.)
     525,000    Anne Arundel County, Maryland, Pollution Control Revenue           2004 at 102           A            A2
                  Refunding Bonds (Baltimore Gas and Electric Company
                  Project), Series 1994, 6.00% Due 4/1/24.
     500,000    Baltimore County Revenue Authority (Maryland), Revenue             2003 at 102          --             A
                  Refunding Bonds, 1993 Series, 5.375% Due 7/1/13.
     500,000    County Commissioners of Charles County, Maryland, Mortgage         2003 at 102          AAA           Aaa
                  Revenue Refunding Bonds, Series 1994A (Holly Station III
                  Townhouses Project-FHA Insured Mortgage Loan), 5.875% Due
                  7/1/25. (MBIA Insured.)
     450,000    Howard County, Maryland, Metropolitan District Project and         2003 at 102          AA+           Aa1
                  Refunding Bonds, 1993 Series A, 5.50% Due 8/15/22.
                  (General Obligation Bonds.)
     525,000    Prince George's County, Maryland, Pollution Control Revenue        2003 at 102          A+            A1
                  Refunding Bonds (Potomac Electric Project), 1993 Series,
                  6.375% Due 1/15/23.
     500,000    Washington Suburban Sanitary District, Maryland, General           2004 at 102          AA            Aa1
                  Construction Refunding Bonds of 1994, 5.00% Due 6/1/13.
                  (General Obligation Bonds.)
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $     97.49          5.54%            5.57%            5.59%
500-999                 50,000-99,999   4.75           97.33          5.55             5.58             5.60
1,000-2,499           100,000-249,999   4.50           97.08          5.56             5.60             5.62
2,500-4,999           250,000-499,999   4.25           96.83          5.58             5.61             5.63
5,000-9,999           500,000-999,999   3.50           96.07          5.62             5.66             5.68
10,000-24,999     1,000,000-2,499,999   3.00           95.58          5.65             5.68             5.70
25,000-49,999     2,500,000-4,999,999   2.50           95.09          5.68             5.71             5.73
50,000 and over    5,000,000 and over   2.00           94.60          5.71             5.74             5.76
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $     97.49          5.69    %        5.73    %        5.74    %
500-999                 50,000-99,999   4.75           97.33          5.69             5.73             5.75
1,000-2,499           100,000-249,999   4.50           97.08          5.71             5.75             5.77
2,500-4,999           250,000-499,999   4.25           96.83          5.72             5.76             5.78
5,000-9,999           500,000-999,999   3.50           96.07          5.77             5.81             5.83
10,000-24,999     1,000,000-2,499,999   3.00           95.58          5.80             5.84             5.86
25,000-49,999     2,500,000-4,999,999   2.50           95.09          5.83             5.87             5.89
50,000 and over    5,000,000 and over   2.00           94.60          5.86             5.90             5.92
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
Maryland Traditional Trust                               1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        7/1            8/1           11/1            2/1            5/1
Distribution Date.....................       7/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4350(1)                                                               $  5.4017
                                                             --------    $.4500 every month    --------
Quarterly Distribution Plan...........  $   .4350(1)   $   .4527(2)   $  1.3581      $  1.3581      $  1.3581      $  5.4337
Semi-Annual Distribution Plan.........  $   .4350(1)                  $  1.8168(3)                  $  2.7252      $  5.4527
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.11 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01500 per unit per day.
Consequently, on the first Record Date (07/01/94), accrued interest will total
$0.4350 per unit for the 29-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 07/01/94 is $.4350 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01500              Quarterly - $0.01509
                             Semi-Annual - $0.01514
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          732
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 26.1 years.
The first bond is scheduled to mature in June, 2013, with the last bond maturity
being July, 2025.
 
- -------------------------------------------------
 
QUALITY OF PORTFOLIO AS RATED BY
STANDARD & POOR'S CORPORATION
OR MOODY'S INVESTORS SERVICES
- -------------------------------------------------
 
<TABLE>
<CAPTION>
       Rating          Percent of Portfolio
      Category              Par Value
<S>                    <C>                   <C>
- -------------------------------------------------------------
AAA                         15%
AA                          27
A1/A+                       29
A                           29
                           ---
                           100%
</TABLE>
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     NATIONAL
     INSURED
     TRUST 270
 
            Estimated Current Return
            First
            Year: 5.71% to 5.93%
            Subsequent
            Years: 5.74% to 5.96%
            as of 06/01/94
 
            Estimated Long Term Return
            5.79% to 6.02%
             100,000 units in a
             diversified $10,000,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67101X 674 Monthly Payment Option
                  67101X 682 Quarterly Payment Option
                  67101X 690 Semi-Annual Payment Option
 
                  Registered in all states
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, NATIONAL INSURED TRUST 270
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT JUNE 2, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $1,000,000    Los Angeles County Transportation Commission (California),         2002 at 102          AAA           Aaa
                  Proposition C Sales Tax Revenue Bonds, Second Senior
                  Bonds, Series 1992-A, 6.00% Due 7/1/23. (Original issue
                  discount bonds delivered on or about November 17, 1992 at
                  a price of 91.172% of principal amount.)
   1,000,000    The City of Los Angeles, California, Wastewater System             2003 at 102          AAA           Aaa
                  Revenue Bonds, Refunding Series 1993-A, 5.80% Due 6/1/21.
   1,000,000    Illinois Health Facilities Authority, Revenue Bonds, Series        2003 at 102          AAA           Aaa
                  1993 (Rush-Presbyterian-St. Luke's Medical Center
                  Obligated Group), 5.50% Due 11/15/25.
   1,000,000    Massachusetts Bay Transportation Authority, General                2003 at 102          AAA           Aaa
                  Transportation System Bonds, 1993
                  Series A Refunding, 5.50% Due 3/1/22. (General Obligation
                  Bonds.)
   1,000,000    Massachusetts Health and Educational Facilities Authority,         2002 at 102          AAA           Aaa
                  Revenue Bonds, Northeastern University Issue, Series E,
                  6.55% Due 10/1/22.
   1,000,000    Bedford Area School District (Bedford County, Penn-                2004 at 100          AAA           Aaa
                  sylvania), General Obligation Bonds, Series A of 1994,
                  6.20% Due 4/15/24. (When issued.)
   1,000,000    Lehigh County, Pennsylvania, General Purpose Authority             2004 at 102          AAA           Aaa
                  Hospital Revenue Bonds (Lehigh Valley Hospital, Inc.),
                  Series A of 1994, 6.25% Due 7/1/22.
   1,000,000    Piedmont Municipal Power Agency (South Carolina), Electric         2003 at 102          AAA           Aaa
                  Revenue Bonds, 1992 Refunding Series, 6.30% Due 1/1/22.
   1,000,000    Baytown Properties Management and Development Corporation          2003 at 100          AAA           Aaa
                  (Baytown, Texas), Refunding Mortgage Revenue Bonds Series
                  1993A (Baytown Terrace Project), 6.10% Due 8/15/21.
   1,000,000    Washington Public Power Supply System, Nuclear Project No. 1       2003 at 102          AAA           Aaa
                  Refunding Revenue Bonds, Series 1993A, 5.70% Due 7/1/17.
  ----------
  $10,000,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                              Estimated Current Return (2)
          AMOUNT PURCHASED                         Public      -----------------------------------------------------------
- -------------------------------------  Sales      Offering         Monthly           Quarterly            Semi-Annual
     Units              Dollars        Charge     Price (1)        Payment            Payment               Payment
- ----------------  -------------------  ------    -----------   ---------------    ---------------    ---------------------
<S>               <C>                  <C>       <C>           <C>       <C>      <C>       <C>      <C>       <C>
50-499                 $5,000-$49,999   4.90 %   $    100.80     (5.71%)  5.74%     (5.74%)  5.77%     (5.76%)  5.79%
500-999                 50,000-99,999   4.75          100.64     (5.71)   5.75      (5.75)   5.78      (5.77)   5.80
1,000-2,499           100,000-249,999   4.50          100.38     (5.73)   5.76      (5.76)   5.79      (5.78)   5.81
2,500-4,999           250,000-499,999   4.25          100.12     (5.74)   5.78      (5.78)   5.81      (5.80)   5.83
5,000-9,999           500,000-999,999   3.50           99.34     (5.79)   5.82      (5.82)   5.85      (5.84)   5.87
10,000-24,999     1,000,000-2,499,999   3.00           98.82     (5.82)   5.85      (5.85)   5.88      (5.87)   5.90
25,000-49,999     2,500,000-4,999,999   2.50           98.32     (5.85)   5.88      (5.88)   5.91      (5.90)   5.93
50,000 and over    5,000,000 and over   2.00           97.82     (5.88)   5.91      (5.91)   5.94      (5.93)   5.96
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $    100.80          5.79    %        5.82    %        5.84    %
500-999                 50,000-99,999   4.75          100.64          5.80             5.83             5.85
1,000-2,499           100,000-249,999   4.50          100.38          5.82             5.85             5.86
2,500-4,999           250,000-499,999   4.25          100.12          5.83             5.86             5.88
5,000-9,999           500,000-999,999   3.50           99.34          5.88             5.91             5.93
10,000-24,999     1,000,000-2,499,999   3.00           98.82          5.91             5.94             5.96
25,000-49,999     2,500,000-4,999,999   2.50           98.32          5.94             5.97             5.99
50,000 and over    5,000,000 and over   2.00           97.82          5.97             6.00             6.02
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to the Date of Deposit. Figures in
    brackets represent the current return. The first year's estimated current
    returns are slightly lower than those for subsequent years because a portion
    of the monies received in the first year only will be treated as a return of
    principal due to the inclusion in the portfolio of "when issued" or other
    Bonds having delivery dates after the date of settlement for a purchase made
    on the Date of Deposit.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
National Insured Trust                                   1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        7/1            8/1           11/1            2/1            5/1
Distribution Date.....................       7/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4657(1)                                                               $  5.7824
                                                             --------    $.4818 every month    --------
Quarterly Distribution Plan...........  $   .4657(1)   $   .4845(2)   $  1.4535      $  1.4535      $  1.4535      $  5.8144
Semi-Annual Distribution Plan.........  $   .4657(1)                  $  1.9440(3)                  $  2.9160      $  5.8334
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.11 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01606 per unit per day.
Consequently, on the first Record Date (07/01/94), accrued interest will total
$0.4657 per unit for the 29-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 07/01/94 is $.4657 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01606              Quarterly - $0.01615
                             Semi-Annual - $0.01620
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
<PAGE>
- -------------------------------------------------
 
DIVERSIFICATION OF PORTFOLIO INCOME
 
There are 10 Tax-exempt bond issues in this trust; this diversified portfolio
yields current income from issuers in 7 states.
- -------------------------------------------------
<TABLE>
<CAPTION>
                   Percent
                   of Total
                   Income
<S>                    <C>        <C>
- ------------------------
                                  %
California                  19.7
Illinois                     9.2
Massachusetts               20.1
Pennsylvania                20.8
 
<CAPTION>
                   Percent
                   of Total
                   Income
- ------------------------
<S>                    <C>        <C>
                                  %
South Carolina              10.5
Texas                       10.2
Washington                   9.5
</TABLE>
 
- -------------------------------------------------
 
AVERAGE PORTFOLIO LIFE The average maturity
of portfolio bonds is 27.9 years. The first bond is scheduled to mature in July,
2017, with the last bond maturity being November, 2025.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
 
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
 
732
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     CALIFORNIA
     INSURED
     TRUST 226
 
            Estimated Current Return
            5.60% to 5.82%
            as of 06/01/94
 
            Estimated Long Term Return
            5.72% to 5.95%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67064U 253 Monthly Payment Option
                  67064U 261 Quarterly Payment Option
                  67064U 279 Semi-Annual Payment Option
 
                  Registered in California
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, CALIFORNIA INSURED TRUST 226
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT JUNE 2, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  105,000    California Health Facilities Financing Authority, Kaiser           2002 at 101          AAA           Aaa
                  Permanente, Medical Care Program, Semiannual Tender
                  Revenue Bonds, 1985 Tender Bonds, 5.55% Due 8/15/25.
     110,000    California Health Facilities Financing Authority, Insured          2002 at 102          AAA           Aaa
                  Hospital Revenue Bonds (San Diego Hospital Association),
                  Series 1992B, 6.125% Due 8/1/22.
     295,000    State Public Works Board of the State of California, Lease         No Optional          AAA           Aaa
                  Revenue Bonds (Department of Corrections), 1993 Series E            Call
                  (California State Prison-Madera County II), 5.50% Due
                  6/1/15.
     500,000    Encinitas Public Financing Authority (California), 1993            2003 at 102          AAA           Aaa
                  Water Revenue Bonds, Series A (San Dieguito Water
                  District), 5.25% Due 10/1/23.
     500,000    Los Angeles County Transportation Commission (California),         2002 at 102          AAA           Aaa
                  Proposition C Sales Tax Revenue Bonds, Second Senior
                  Bonds, Series 1992-A, 6.00% Due 7/1/23. (Original issue
                  discount bonds delivered on or about November 17, 1992 at
                  a price of 91.172% of principal amount.)
     500,000    The City of Los Angeles, California, Wastewater System             2003 at 102          AAA           Aaa
                  Revenue Bonds, Refunding Series 1993-A, 5.80% Due 6/1/21.
     500,000    Northern California Power Agency, Hydroelectric Project            2003 at 102          AAA           Aaa
                  Number One, Revenue Bonds, 1993 Refunding Series A, 5.50%
                  Due 7/1/24.
     490,000    Redevelopment Agency of the City of Riverside (California),        2002 at 102          AAA           Aaa
                  Tax Allocation Refunding Bonds, Casa Blanca Redevelopment
                  Project, 1993 Series A, 5.625% Due 8/1/23.
     500,000    County of Sacramento, California (Sacramento County Public         2003 at 102          AAA           Aaa
                  Facilities Financing Corporation), Refunding Certificates
                  of Participation (Sacramento Main Detention Facility
                  Project), 5.75% Due 6/1/15.
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $     96.99          5.60%            5.63%            5.65%
500-999                 50,000-99,999   4.75           96.84          5.61             5.64             5.66
1,000-2,499           100,000-249,999   4.50           96.59          5.62             5.65             5.67
2,500-4,999           250,000-499,999   4.25           96.33          5.64             5.67             5.69
5,000-9,999           500,000-999,999   3.50           95.59          5.68             5.71             5.73
10,000-24,999     1,000,000-2,499,999   3.00           95.09          5.71             5.74             5.76
25,000-49,999     2,500,000-4,999,999   2.50           94.60          5.74             5.77             5.79
50,000 and over    5,000,000 and over   2.00           94.12          5.77             5.80             5.82
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $     96.99          5.72    %        5.75    %        5.77    %
500-999                 50,000-99,999   4.75           96.84          5.72             5.76             5.78
1,000-2,499           100,000-249,999   4.50           96.59          5.74             5.78             5.80
2,500-4,999           250,000-499,999   4.25           96.33          5.75             5.79             5.81
5,000-9,999           500,000-999,999   3.50           95.59          5.80             5.84             5.86
10,000-24,999     1,000,000-2,499,999   3.00           95.09          5.83             5.87             5.89
25,000-49,999     2,500,000-4,999,999   2.50           94.60          5.86             5.90             5.92
50,000 and over    5,000,000 and over   2.00           94.12          5.89             5.93             5.95
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
California Insured Trust                                 1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        7/1            8/1           11/1            2/1            5/1
Distribution Date.....................       7/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4373(1)                                                               $  5.4296
                                                             --------    $.4524 every month    --------
Quarterly Distribution Plan...........  $   .4373(1)   $   .4551(2)   $  1.3653      $  1.3653      $  1.3653      $  5.4616
Semi-Annual Distribution Plan.........  $   .4373(1)                  $  1.8264(3)                  $  2.7396      $  5.4806
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.11 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01508 per unit per day.
Consequently, on the first Record Date (07/01/94), accrued interest will total
$0.4373 per unit for the 29-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 07/01/94 is $.4373 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01508              Quarterly - $0.01517
                             Semi-Annual - $0.01522
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          732
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 27.2 years.
The first bond is scheduled to mature in June, 2015, with the last bond maturity
being August, 2025.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     FLORIDA
     INSURED
     TRUST 191
 
            Estimated Current Return
            First
            Year: 5.57% to 5.79%
            Subsequent
            Years: 5.58% to 5.80%
            as of 06/01/94
 
            Estimated Long Term Return
            5.60% to 5.83%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H3 317 Monthly Payment Option
                  6706H3 325 Quarterly Payment Option
                  6706H3 333 Semi-Annual Payment Option
 
                  Registered in Florida
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, FLORIDA INSURED TRUST 191
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT JUNE 2, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  250,000    State of Florida, Full Faith and Credit, State Board of            2003 at 101          AAA           Aaa
                  Education, Public Education Capital Outlay Bonds, 1992
                  Series C, 5.875% Due 6/1/23. (General Obligation Bonds.)
     500,000    Florida Municipal Power Agency, St. Lucie Project Refunding        2002 at 102          AAA           Aaa
                  Revenue Bonds, Series 1992, 5.25% Due 10/1/21. (Original
                  issue discount bonds delivered on or about September 1,
                  1992 at a price of 91.655% of principal amount.)
     500,000    State of Florida, Department of Transportation, Turnpike           2003 at 101          AAA           Aaa
                  Revenue Refunding Bonds, Series 1993A, 5.25% Due 7/1/22.
                  (Original issue discount bonds delivered on or about May
                  27, 1993 at a price of 94.043% of principal amount.)
     500,000    Hillsborough County Industrial Development Authority               2004 at 102          AAA           Aaa
                  (Florida), Industrial Development Revenue Bonds, Series
                  1994 (University Community Hospital), 5.80% Due 8/15/24.
     500,000    City of North Miami Beach, Florida, General Obligation             2004 at 102          AAA           Aaa
                  Bonds, Series 1994, 6.30% Due 2/1/24.
     525,000    Orange County, Florida, Tourist Development Tax Revenue            2002 at 100          AAA           Aaa
                  Bonds, Series 1992B, 6.00% Due 10/1/21. (Original issue
                  discount bonds delivered on or about April 21, 1992 at a
                  price of 91.375% of principal amount.)
     200,000    City of Starke, Florida, Utilities Revenue and Refunding           2004 at 102          AAA           Aaa
                  Bonds, Series 1994, 6.15% Due 7/1/19. (When issued.)
     525,000    Commonwealth of Puerto Rico, Public Improvement Bonds of           2004 at 101          AAA           Aaa
                  1994 (General Obligation Bonds), 6.50% Due 7/1/23.                   1/2
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                              Estimated Current Return (2)
          AMOUNT PURCHASED                         Public      -----------------------------------------------------------
- -------------------------------------  Sales      Offering         Monthly           Quarterly            Semi-Annual
     Units              Dollars        Charge     Price (1)        Payment            Payment               Payment
- ----------------  -------------------  ------    -----------   ---------------    ---------------    ---------------------
<S>               <C>                  <C>       <C>           <C>       <C>      <C>       <C>      <C>       <C>
50-499                 $5,000-$49,999   4.90 %   $    101.22     (5.57%)  5.58%     (5.60%)  5.61%     (5.62%)  5.63%
500-999                 50,000-99,999   4.75          101.06     (5.58)   5.59      (5.61)   5.62      (5.63)   5.64
1,000-2,499           100,000-249,999   4.50          100.80     (5.59)   5.60      (5.63)   5.63      (5.64)   5.65
2,500-4,999           250,000-499,999   4.25          100.53     (5.61)   5.61      (5.64)   5.65      (5.66)   5.67
5,000-9,999           500,000-999,999   3.50           99.75     (5.65)   5.66      (5.68)   5.69      (5.70)   5.71
10,000-24,999     1,000,000-2,499,999   3.00           99.24     (5.68)   5.69      (5.71)   5.72      (5.73)   5.74
25,000-49,999     2,500,000-4,999,999   2.50           98.73     (5.71)   5.72      (5.74)   5.75      (5.76)   5.77
50,000 and over    5,000,000 and over   2.00           98.22     (5.74)   5.75      (5.77)   5.78      (5.79)   5.80
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $    101.22          5.60    %        5.64    %        5.66    %
500-999                 50,000-99,999   4.75          101.06          5.61             5.65             5.66
1,000-2,499           100,000-249,999   4.50          100.80          5.63             5.66             5.68
2,500-4,999           250,000-499,999   4.25          100.53          5.64             5.68             5.69
5,000-9,999           500,000-999,999   3.50           99.75          5.68             5.72             5.74
10,000-24,999     1,000,000-2,499,999   3.00           99.24          5.71             5.75             5.77
25,000-49,999     2,500,000-4,999,999   2.50           98.73          5.74             5.78             5.80
50,000 and over    5,000,000 and over   2.00           98.22          5.77             5.81             5.83
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to the Date of Deposit. Figures in
    brackets represent the current return. The first year's estimated current
    returns are slightly lower than those for subsequent years because a portion
    of the monies received in the first year only will be treated as a return of
    principal due to the inclusion in the portfolio of "when issued" or other
    Bonds having delivery dates after the date of settlement for a purchase made
    on the Date of Deposit.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
Florida Insured Trust                                    1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        7/1            8/1           11/1            2/1            5/1
Distribution Date.....................       7/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4544(1)                                                               $  5.6444
                                                             --------    $.4701 every month    --------
Quarterly Distribution Plan...........  $   .4544(1)   $   .4728(2)   $  1.4184      $  1.4184      $  1.4184      $  5.6764
Semi-Annual Distribution Plan.........  $   .4544(1)                  $  1.8984(3)                  $  2.8476      $  5.6954
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.11 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01567 per unit per day.
Consequently, on the first Record Date (07/01/94), accrued interest will total
$0.4544 per unit for the 29-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 07/01/94 is $.4544 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01567              Quarterly - $0.01576
                             Semi-Annual - $0.01582
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          732
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 28.4 years.
The first bond is scheduled to mature in July, 2019, with the last bond maturity
being August, 2024.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     OHIO
     INSURED
     TRUST 115
 
            Estimated Current Return
            5.56% to 5.78%
            as of 06/01/94
 
            Estimated Long Term Return
            5.60% to 5.83%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67101Y 409 Monthly Payment Option
                  67101Y 417 Quarterly Payment Option
                  67101Y 425 Semi-Annual Payment Option
 
                  Registered in Ohio
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, OHIO INSURED TRUST 115
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT JUNE 2, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  500,000    Ohio Water Development Authority, State of Ohio,                   2002 at 102          AAA           Aaa
                  Collateralized Water Development Revenue Refunding Bonds,
                  1992 Series A (The Dayton Power and Light Company
                  Project), 6.40% Due 8/15/27.
     300,000    City of Akron, Ohio, Waterworks System Mortgage Revenue            2004 at 102          AAA           Aaa
                  Improvement Bonds, Series 1994, 6.00% Due 3/1/14. (When
                  issued.)
     475,000    Akron, Bath and Copley Joint Township Hospital District,           2003 at 102          AAA           Aaa
                  Ohio, Hospital Refunding Revenue Bonds, Series 1993
                  (Children's Hospital Medical Center of Akron), 5.25% Due
                  11/15/20.
     500,000    City of Hamilton], Ohio, Electric System Mortgage Revenue          2002 at 102          AAA           Aaa
                  Refunding Bonds, 1992 Series A, 6.00% Due 10/15/23.
     250,000    City of Hamilton], Ohio, Gas System Revenue Bonds, 1993            2003 at 102          AAA           Aaa
                  Series A, 5.15% Due 10/15/13.
     500,000    County of Lucas, Ohio, Hospital Refunding Revenue Bonds,           2003 at 102          AAA           Aaa
                  Series 1993B (St. Vincent Medical Center), 5.375% Due
                  8/15/17.
     500,000    The University of Toledo (A State University of Ohio),             2002 at 102          AAA           Aaa
                  General Receipts Bonds, Series 1992A, 5.90% Due 6/1/20.
     475,000    Commonwealth of Puerto Rico, Public Improvement Bonds of           2004 at 101          AAA           Aaa
                  1994 (General Obligation Bonds), 6.50% Due 7/1/23.                   1/2
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $    101.35          5.56%            5.59%            5.61%
500-999                 50,000-99,999   4.75          101.19          5.57             5.60             5.62
1,000-2,499           100,000-249,999   4.50          100.92          5.59             5.62             5.64
2,500-4,999           250,000-499,999   4.25          100.66          5.60             5.63             5.65
5,000-9,999           500,000-999,999   3.50           99.88          5.64             5.68             5.70
10,000-24,999     1,000,000-2,499,999   3.00           99.36          5.67             5.71             5.73
25,000-49,999     2,500,000-4,999,999   2.50           98.85          5.70             5.74             5.76
50,000 and over    5,000,000 and over   2.00           98.35          5.73             5.77             5.78
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $    101.35          5.60    %        5.64    %        5.66    %
500-999                 50,000-99,999   4.75          101.19          5.61             5.65             5.66
1,000-2,499           100,000-249,999   4.50          100.92          5.63             5.66             5.68
2,500-4,999           250,000-499,999   4.25          100.66          5.64             5.68             5.69
5,000-9,999           500,000-999,999   3.50           99.88          5.68             5.72             5.74
10,000-24,999     1,000,000-2,499,999   3.00           99.36          5.71             5.75             5.77
25,000-49,999     2,500,000-4,999,999   2.50           98.85          5.74             5.78             5.80
50,000 and over    5,000,000 and over   2.00           98.35          5.77             5.81             5.83
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
Ohio Insured Trust                                       1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        7/1            8/1           11/1            2/1            5/1
Distribution Date.....................       7/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4541(1)                                                               $  5.6379
                                                             --------    $.4698 every month    --------
Quarterly Distribution Plan...........  $   .4541(1)   $   .4722(2)   $  1.4166      $  1.4166      $  1.4166      $  5.6699
Semi-Annual Distribution Plan.........  $   .4541(1)                  $  1.8960(3)                  $  2.8440      $  5.6889
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.11 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01566 per unit per day.
Consequently, on the first Record Date (07/01/94), accrued interest will total
$0.4541 per unit for the 29-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 07/01/94 is $.4541 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01566              Quarterly - $0.01574
                             Semi-Annual - $0.01580
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          732
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 26.6 years.
The first bond is scheduled to mature in October, 2013, with the last bond
maturity being August, 2027.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.


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